Holding apparatus and method for dispensers of hardenable materials

ABSTRACT

A holding system for a dispensing system for hardenable materials comprising a dispensing gun and a product cartridge having a dispensing tip defining a dispensing opening. The holding system comprises a holding structure and a plug projection. Optionally, one or more guide ribs may be used. The holding structure comprises a side wall and a bottom wall and defines a main opening and a cartridge chamber. The plug projection extends from the bottom wall into the cartridge chamber. The at least one guide rib extends from the side wall into the cartridge chamber. The cartridge chamber is sized and dimensioned to receive the product cartridge. When the product cartridge is placed into the cartridge chamber, the guide rib is arranged to engage a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening. Optionally, one or more wall openings may be formed in the holding structure adjacent to the plug projection.

RELATED APPLICATIONS

[0001] The present application claims priority of U.S. Provisional Patent Application Serial No. 60/392,288 filed Jun. 26, 2002, the specification of which is incorporated herein by reference.

FIELD OF THE INVENTION

[0002] The present invention relates to systems and methods for storing dispensers of hardenable material and, more specifically, to systems and methods for storing dispensing gun assemblies containing opened cartridges of hardenable materials.

BACKGROUND OF THE INVENTION

[0003] Many construction tasks require the application of hardenable materials. The term “hardenable” is used herein to refer materials that dry upon exposure to air such that they are no longer flowable. A hardenable material that has dried upon exposure to air may retain some resiliencey; the term “hardenable” thus does not necessarily suggest that a hardenable material is rigid or unyielding when dry.

[0004] The types of hardenable materials employed during construction tasks include caulking materials, construction adhesives, and the like. These types of hardenable materials are typically viscous upon manufacture and remain flowable when not exposed to air. Typically, the hardenable material is formulated such that the material is no longer flowable anywhere from five minutes to two hours after exposure to air. Accordingly, hardenable materials used during construction are typically manufactured, shipped, and sold in a sealed storage container. Immediately prior to use, a dispensing opening is formed in the sealed storage container through which the hardenable material may be dispensed.

[0005] Some hardenable materials may be dispensed directly from the storage container. For example, certain caulking materials are sold in a deformable tube having an integral dispensing tip. Once the dispensing tip has been cut to form a dispensing opening, the tube is squeezed to dispense the caulking material through the dispensing opening.

[0006] For a variety of reasons, other hardenable materials can not be easily or conveniently dispensed by applying pressure directly to the storage container. Some hardenable materials are simply too viscous to be dispensed by direct hand pressure to the container. Other hardenable materials must be dispensed in relatively large quantities, and the use of direct hand pressure can cause operator fatigue.

[0007] Accordingly, many hardenable materials are dispensed using a dispensing system comprising dispensing gun and a product cartridge. A dispensing gun uses a lever to displace an actuator rod that forces the hardenable material out of the product cartridge. The operator applies hand pressure to the lever which in turn acts on the rod, thereby creating a mechanical advantage that assists in the dispensing of the material. Typically, dispensing guns allows highly viscous materials to be dispensed using hand pressure. Dispensing guns can also allow an operator to dispense relatively larger quantities of the hardenable material without fatigue. Some types of dispensing guns may assist the operator using electric, hydraulic, pneumatic, or other systems for generating mechanical forces.

[0008] When a hardenable material is to be dispensed using a dispensing gun, the hardenable material is typically stored in the product cartridge prior to use. The product cartridge typically comprises a paperboard cylinder, a dispensing tip, and a floating piston member. The dispensing tip is attached to a first end of the cylinder, and the piston member is initially position within the cylinder adjacent to a second end thereof. When originally manufactured, the entire cartridge is substantially air tight to prevent the hardenable material from drying prior to use.

[0009] Immediately prior to use, the cartridge is placed in the dispensing gun with the piston member adjacent to the actuator rod. The dispensing tip is also cut or pierced to form a dispensing opening. The operator arranges the dispensing opening adjacent to the surface where the material is to be dispensed. The operator then applies manual force to the lever. The lever forces the actuator rod against the piston member, which in turn applies pressure to the hardenable material. The pressure on the hardenable material causes the hardenable material to flow out of the dispensing opening.

[0010] Once the dispensing opening has been formed, the cartridge is no longer air-tight. In particular, the hardenable material in the dispensing tip adjacent to the dispensing opening is in direct contact with the air. If the material within the dispensing tip is allowed to dry out, the dispensing opening may become blocked, and the entire cartridge may be unusable.

[0011] As long as the operator continues to operate the dispensing gun, the hardenable material in the dispensing tip does not have a chance to dry out. Often, however, the operator will be interrupted while using a dispensing gun with an opened cartridge of hardenable material. If the interruption is longer than the drying time of the hardenable material, the dispensing opening may become blocked and the cartridge may become unusable. Typically, an operator will simply discard a cartridge that has become blocked regardless of how much material remains within the cartridge. A similar situation occurs at the end of the day or when the operator completes a job.

[0012] Another problem with existing dispensing systems arises from the back pressure created by the relatively viscous hardenable materials. When the lever is actuated to displace the actuator rod and piston member, a relatively high pressure zone is created within the cartridge. The viscosity of the hardenable material typically creates a back pressure that causes the high pressure within the cartridge to decay over time. Accordingly, the pressure within the cylinder persists after the pressure is no longer applied by the piston member. This residual pressure continues to cause the hardenable material to flow out of the dispensing opening after the operator has stopped actuating the lever. The operator must wait for the residual pressure to dissipate or find a place where excess hardenable material can be dispensed. The flow of dispensing material caused by residual pressure within the cartridge can thus reduce the productivity of the operator.

[0013] Another problem with conventional dispensing systems is where to put the dispensing gun when not in use. For example, an operator could be using a construction adhesive while framing a house. In this case, the operator may apply the adhesive to secure one step board to another nail the two boards together, and then fetch the next board. When the operator is nailing the first two boards together and fetching the next board, the dispensing gun must be temporarily stored at an out of the way location until the adhesive is to be used with the next board. This temporary storage is complicated by the continued flow of material caused by residual pressure within the cartridge.

[0014] From the foregoing, it should be apparent that the need exists for systems and methods for holding dispensers for hardenable materials.

SUMMARY OF THE INVENTION

[0015] The present invention is a holding system for a dispensing system for hardenable materials. The dispensing system conventionally comprises a dispensing gun and a product cartridge having a dispensing tip defining a dispensing opening. The holding system comprises a holding structure and a plug projection. The holding structure comprises a side wall and a bottom wall and defines a main opening and a cartridge chamber. The plug projection extends from the bottom wall into the cartridge chamber. The at least one guide rib extends from the side wall into the cartridge chamber. The cartridge chamber is sized and dimensioned to receive the product cartridge. Optionally, one or more guide ribs may be used. When the product cartridge is placed into the cartridge chamber, the guide rib is arranged to engage a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening. Optionally, one or more wall openings may be formed in the holding structure adjacent to the plug projection.

BRIEF DESCRIPTION THE DRAWING

[0016]FIG. 1 is a side elevational view showing one exemplary holding system of the present invention supporting a dispensing gun from the belt of an operator;

[0017]FIG. 2 is a sectional view taken through a longitudinal center line of the holding system of FIG. 1, also showing in section the dispensing gun supported thereby;

[0018]FIG. 3 is a sectional view taken through a longitudinal center line of the holding system of FIG. 1, also showing in section another example of a dispensing gun supported thereby;

[0019]FIG. 4 is a side elevational view showing the exemplary holding system of FIG. 1 in further detail;

[0020]FIG. 5 is a top plan view showing the exemplary holding system of FIG. 1 in further detail;

[0021]FIG. 6 is a sectional view taken along lines 6-6 in FIG. 5;

[0022]FIG. 7 is a sectional view taken along lines 7-7 in FIG. 5;

[0023]FIG. 8 is a sectional view taken along lines 8-8 in FIG. 5;

[0024] FIGS. 9-11 are top plan views showing the exemplary holding system of FIG. 1 accommodating dispensing guns of different form factors;

[0025]FIG. 12 is a sectional view taken through the longitudinal center line of another exemplary holding system of the present invention shown supporting a dispensing gun;

[0026]FIG. 13 is a side elevation view of the holding system of FIG. 12 shown being supported by a belt;

[0027]FIG. 14 is a partial sectional view taken through the longitudinal center line of yet another exemplary holding system of the present invention;

[0028]FIG. 15 is an exploded, partial sectional view taken through the longitudinal center line of the exemplary holding system of FIG. 14;

[0029]FIG. 16 is a perspective view of yet another exemplary holding system of the present invention;

[0030]FIG. 17 is a partial sectional view taken through the longitudinal center line of the exemplary holding system of FIG. 16;

[0031]FIGS. 18 and 19 are side elevation views of still another exemplary holding system of the present invention; and

[0032]FIG. 20 is a side elevation view of another embodiment of an exemplary holding system of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Referring initially to FIG. 1, depicted therein is a holding system 20 constructed in accordance with, and embodying, the principles of the present invention. The holding system 20 is shown supporting a dispensing assembly 22 in a desired relationship from a belt 24 worn by an operator 26.

[0034] The dispensing assembly 22 is or may be conventional and will be described herein only to the extent necessary for a complete understanding of the present invention. As shown in FIGS. 2 and 3, the dispensing assembly 22 comprises a dispensing gun 30 and a product cartridge 32. The product cartridge 32 defines a dispensing tip 34. The dispensing tip 34 has been cut or pierced to define a tip opening 34.

[0035] The form factor of the product cartridge 32 has been relatively standardized in the marketplace, although conventional product cartridges come in different sizes. Dispensing guns 30 are manufactured to accept the form factor of the product cartridge 32 in each of the different sizes.

[0036] The designs of the dispensing guns are not standardized. In particular, FIGS. 9-11 illustrate three different dispensing gun configurations 30 a, 30 b, and 30 c each having a unique structure and defining a unique projection 38 a, 38 b, and 38 c, respectively. The exact details of any one of the projections 38 are not critical to the present invention other than to note that the exemplary holding system 20 accommodates each of these projections 38 as will be described in further detail below.

[0037] As perhaps best shown in FIGS. 2-8, the holding system 20 comprises a holding structure 40 having a side wall 42 and a bottom wall 44. The holding structure 40 defines a holding chamber 46 and a main opening 48. Extending from the bottom wall 44 into the holding chamber 46 is a plug projection 50. In addition, a plurality of guide ribs 52 extend from the side wall 42 into the holding chamber 46.

[0038] Optionally, one or more wall openings 54 may be formed in the side wall 42 adjacent to the plug projection 50. Additionally, in the exemplary system 20, a projection cavity 56 is formed in the bottom wall 44 below the plug projection 54. A lower portion 58 of the holding chamber 46 is located between the plug projection 50 and the wall openings 54.

[0039]FIGS. 4 and 6 illustrate a belt clip 60 that may be optionally used to facilitate suspending the holding structure 40 from the operator's belt 24. In the exemplary holding system 20, a clip projection 62 defining a clip wall 64 is formed on the holding structure 40 adjacent to the main opening 48. The clip wall 64 defines a flat surface 66 appropriate for mounting of the clip 60. FIG. 6 illustrates a rivet assembly 68 that may be used to attach the clip 60 to the holding structure 40, but other attachment systems may be used. In addition, the clip 60 can be integrally formed with the holding structure using some manufacturing techniques and materials.

[0040] The use of the holding system 20 will now be described with reference to FIGS. 2 and 3. As shown, at least a portion of the dispensing assembly 22 is extended through the main opening 48 and into the holding chamber 46. In FIGS. 2 and 3, the dispensing assembly 22 is shown in a storage position relative to the holding structure 40. In this storage position, the tip opening 36 receives at least a portion of the plug projection 50. The plug projection 50 engages the dispensing tip 34 to block the tip opening 36 and thus inhibit interaction of the material within the cartridge 32 and the ambient air.

[0041] When the dispensing assembly 22 is in the storage position, the plug projection 50 thereby inhibits drying of the material within the cartridge 32. The operator 26 can thus leave the dispensing assembly 22 in the storage position without drying of the hardenable material in the dispensing tip 34 for a period of time substantially longer than if the dispensing assembly 22 is left unprotected.

[0042] In FIG. 2, the dispensing tip 34 a depicted therein is cut to define a relatively smaller tip opening 36 a, while in FIG. 3 the dispensing tip 34 b is cut to define a relative larger tip opening 36 b. The exemplary plug projection 50 is conical in shape to accommodate either of these sizes of tip openings 36 a or 36 b.

[0043] When the belt clip 60 is used, the holding structure 40 may be secured in a conventional manner to the wearer's belt 24. When the holding structure 40 is secured to the wearer's belt 24 and the dispensing assembly 22 is in the storage position, the dispensing assembly 22 may easily be carried and stored while the operator 26 moves about or works on other tasks.

[0044] The guide ribs 52 are arranged to facilitate placement by the operator 26 of the dispensing assembly 22 into the storage position. As will be described in further detail below, the guide ribs 52 are arranged to guide the dispensing assembly 22 along a center line A of the holding structure 40 such that the tip opening 36 receives the plug projection 50.

[0045] The wall openings 54 allow easy access to a portion of the holding chamber 46 adjacent to the bottom wall 44 where the plug projection 50 is located. The wall openings 54 thus allow any hardenable material that accumulates in the lower portion 58 of the holding chamber 46 around the plug projection 50 to be removed without having to reach through the main opening 48. The wall openings 54 further allow the operator 26 to reach into the lower portion 58 of the holding chamber 46 to help guide the plug projection 40 into the tip opening 36.

[0046] FIGS. 4-6 illustrate that, in the exemplary holding system 20, optional wall projections 70 and wall notches 72 are formed in the side wall 42 of the holding structure 40. The wall projections 70 and wall notches 72 allow certain types of the dispensing guns 30 to be placed into the holding chamber 46 without interference by the holding structure 40. The use of the wall projections 70 instead of longer wall notches 72 increases the strength of the holding structure 40. The use of two sets of projections 70 and notches 72 allows the holding system 20 to be used on either the right or left side of the wearer 26 with the dispensing gun 30 facing either forward or backwards relative to the wearer 26.

[0047] Referring now to FIGS. 5 and 6, these figures show that the side wall 42 defines an inner surface 80 and an outer surface 82, and FIG. 5 shows that the guide ribs 52 define rib edges 84. The rib edges 84 are substantially parallel to the centerline A, while the inner surface 80 is slightly angled with respect to the centerline A. The angled inner surface 80 facilitates the manufacture of the holding structure 40 using the injection molding process, while the parallel rib edges 84 guide the dispensing assembly 22 into the holding chamber 46.

[0048] More specifically, as shown in FIG. 5, the rib edges 84 define a profile cylinder B (extending out of the page in FIG. 5). The profile cylinder B divides the holding chamber 46 into a central portion 90 and front, outer, rear, and inner (with respect to the operator 26) perimeter portions 92, 94, 96, and 98. The central portion 90 is sized and dimensioned to receive that portion of the dispensing assembly 22 that is common to most types of dispensing assemblies. As shown in FIGS. 9-11, the perimeter portions 92-98 are sized, dimensioned, and located to accommodate any projections 38 a, 38 b, or 38 c from the dispensing assembly 22 that may be associated with particular dispensing guns 30 a, 30 b, and 30 c.

[0049] The holding structure 40 is thus capable of accommodating dispensing assemblies of many different or unknown form factors while still guiding the dispensing assembly 22 into the storage position with the plug projection 50 received by the tip opening 36.

[0050] Referring now to FIG. 12, depicted therein is yet another holding system 120 constructed in accordance with, and embodying, the principles of the present invention. The holding system 120 comprises a holding structure 122 comprising a barrel portion 124 and a cap portion 126. As shown in FIG. 13, the holding system 120 may be supported by a hammer loop 128 extending from the wearer's belt 24.

[0051] The barrel portion 124 of the holding structure 122 comprises a first side wall portion 130 and defines first and second barrel openings 132 and 134. A first threaded portion is formed on the first side wall portion 130 adjacent to the second barrel opening 134. A flange portion 138 is formed on the first side wall portion 130 adjacent to the first barrel opening 132.

[0052] The cap portion 126 of the barrel structure comprises a second side wall portion 140 and a bottom wall portion 142. A second threaded portion 144 is formed on the second side wall portion 140. A plug projection 146 extends from the bottom wall portion 142.

[0053] The first and second threaded portions 136 and 144 are mated to detachably attach the cap portion 126 to the barrel portion 124 and form the holding structure 122. When the holding structure 122 is formed, a holding chamber 148 is defined, and the plug projection 146 extends into the holding chamber 148.

[0054] The first barrel opening 132 corresponds to the main opening 48 of the holding system 20 of the first embodiment described above. Similarly, the plug projection 146 corresponds to the plug projection 50 of the system 20. The construction and use of the holding system 120 are in many respects the same as the construction and use of the holding system 20 described above and will not be described herein again in detail. The primary difference between the systems 20 and 120 is that the cap portion 126 may be removed to allow cleaning of the area around the plug projection 50.

[0055] Referring now to FIGS. 14 and 15, depicted at 150 therein is an alternative embodiment 126 a of the cap portion 126. In particular, the cap portion 126 a defines a second side wall portion 150 and bottom wall portion 152. A second threaded portion 154 is formed on the second side wall portion 150, and a plug opening 156 is formed in the bottom wall portion 152. A third threaded portion 158 is formed in the bottom wall portion 152 around the plug opening 156. The cap portion 126 a comprises a projection member 160 defining a plug portion 162 and a fourth threaded portion 164.

[0056] As with the cap portion 126 described above, the second threaded portion 154 of the cap portion 126 a engages the second threaded portion 136 on the barrel portion 124 to form a holding structure. Additionally, the fourth threaded portion 164 of the projection member 160 engages the third threaded portion 158 to detachably attach the plug portion 162 to the cap portion 126 a. As shown in FIG. 15, different plug members 160 and 160 a, each defining a plug portion 162 and plug portion 162 a having a different size and shape, may be used. Accordingly, with smaller tip openings 36, the plug member 160 may be used, and with larger tip openings 36, the plug member 160 a may be used. These principles may also be applied to the holding structure 40 described above.

[0057]FIGS. 16 and 17 depicted an alternative structure for securing a cap portion 126 b onto a barrel portion 124 a to form an alternative holding structure 122 a. The barrel portion 124 b comprises a first side wall portion 170 having a detent projection 172 and a flange portion 174. An optional belt clip 176 is shown integrally formed with the barrel portion 124 a. The cap portion 126 b comprises a second side wall portion 180 and a bottom wall portion 182. A plug projection 184 extends from the bottom wall portion 182. The second side wall portion 180 defines a detent ear 186 in which is formed a detent opening 188.

[0058] The detent ears 186 are made of a resilient material that deforms slightly and then returns to its original position. In use, the cap portion 126 b is displaced towards the barrel portion 124 a such that the detent ears 186 engage the detent projections 172. Further displacement of the cap portion 126 causes the detent projections 172 to deform the detent ears 186.

[0059] When the detent projections 172 encounter the detent openings 188, the detent ears 186 return to their original position with the detent projections 172 within the detent openings 188. In this position, the cap portion 126 b is secured to the barrel portion 124 a. Displacing the detent ear 186 away from the first side wall portion 170 of the barrel portion 124 a allows the detent projection 172 to be removed from the detent opening 188 to detach the cap portion 126 b from the barrel portion 124 a.

[0060] The use of the holding structure 122 a is substantially the same as the structure 122 described above and will not be described again.

[0061] Referring now to FIGS. 18 and 19, depicted therein is yet another holding system 220 constructed in accordance with, and embodying, the principles of the present invention. In particular, the holding system comprises, in addition to the holding structure 40 described above, a support assembly 222.

[0062] The support assembly 222 comprises a hinge portion 224, a brace portion 226, and a ground engaging portion 228. The hinge portion 224 is rigidly connected to the holding structure 40. The hinge portion 224 further rotatably attaches the brace portion 226 to the holding structure 40 such that the brace portion 226 rotates between retracted (FIG. 18) and extended (FIG. 19) positions.

[0063] With the brace portion 226 in the retracted position, the holding system 220 is used in the same manner as the holding system 220 described above. With the brace portion 226 in the extended position, the holding structure 40 and the ground engaging portion 228 may be placed on a support surface S to maintain the dispensing system 22 in a desired orientation relative to the support surface S. Typically, the dispensing system 22 will be held at an angle relative to the surface S.

[0064] Referring now to FIG. 20, depicted therein is yet another holding system 230 constructed in accordance with, and embodying, the principles of the present invention. In particular, the holding system comprises, in addition to the holding structure 40 described above, a support rack 232.

[0065] The support rack 232 comprises a base portion 234, an upright portion 236, and a collar portion 238. Optionally, an alignment projection 240 may be formed in the base portion 234.

[0066] In use, the base portion 234 is placed on a support surface with the upright portion 236 supporting the collar portion 238 above the support surface. The holding structure 40 is placed onto the support rack 232 with the collar portion 236 and base portion 234 maintaining the dispensing system 22 in a desired orientation relative to the support surface. The alignment projection 240 may engage the optional projection cavity 56 formed in the holding structure 40 to stabilize the holding system 230. Typically, the dispensing system 22 will be held at an angle relative to the surface.

[0067] Given the foregoing, it should be clear to one of ordinary skill in the art that the present invention may be embodied in forms other than those described above. The scope of the present invention should be determined by the following claims and not the foregoing detailed description. 

I claim:
 1. A holding system for a dispensing system for hardenable materials, the dispensing system comprising a dispensing gun and a product cartridge having a dispensing tip defining a dispensing opening, the holding system comprising: a holding structure comprising a side wall and a bottom wall, where the structure defines a main opening and a holding chamber; a plug projection extending from the bottom wall into the holding chamber; whereby the holding chamber is sized and dimensioned to receive the product cartridge.
 2. A holding system as recited in claim 1, in which at least one wall opening is formed in the holding structure adjacent to the plug projection.
 3. A holding system as recited in claim 1, in which a plurality of guide ribs extend from the side wall into the holding chamber, where, when the product cartridge is placed into the holding chamber, at least one of the guide ribs engages a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening.
 4. A holding system as recited in claim 3, in which the guide ribs define a central portion of the holding chamber and at least one perimeter portion of the holding chamber, where the guide ribs and at least one perimeter portion are sized, dimensioned, and located to allow the dispensing system to be displaced into the holding chamber such that the plug projection may enter the dispensing opening.
 5. A holding system as recited in claim 1, further comprising a belt clip secured to the holding structure, where the belt clip allows the holding structure to be suspended from a belt worn by an operator.
 6. A holding system as recited in claim 1, further comprising at least one guide rib extending from the side wall into the holding chamber, whereby, when the product cartridge is placed into the holding chamber, the guide rib is arranged to engage a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening.
 7. A holding system as recited in claim 1, in which the holding structure comprises a barrel portion and a cap portion, where: the barrel portion defines a portion of the side wall; the cap portion defines a portion of the side wall and the bottom wall; and the cap portion is detachably attached to the barrel portion to facilitate access to the plug projection.
 8. A holding system as recited in claim 1, in which the holding structure comprises a container portion and a projection member, where: the container portion defines the side wall and the bottom wall; and the projection member is detachably attached to the container portion such that the projection member defines the plug projection.
 9. A holding system as recited in claim 1, further comprising a support assembly attached to the holding structure, where the support assembly supports the holding structure in a desired orientation relative to a support surface.
 10. A holding system as recited in claim 1, further comprising a support rack, where the support rack engages the holding structure to support the holding structure in a desired orientation relative to a support surface.
 11. A method of holding a dispensing system for hardenable materials, the dispensing system comprising a dispensing gun and a product cartridge having a dispensing tip defining a dispensing opening, the method comprising the steps of: providing a holding structure comprising a side wall and a bottom wall, where the holding structure defines a main opening and a holding chamber and the holding chamber is sized and dimensioned to receive the product cartridge; forming a plug projection on the bottom wall of the holding structure, where the plug projection extends into the holding chamber; and forming at least one guide rib on the side wall of the holding structure, where the at least one guide rib extends into the holding chamber; displacing the product cartridge into the holding chamber such that the guide rib engages a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening.
 12. A method as recited in claim 11, further comprising the steps of forming at least one wall opening in the holding structure adjacent to the plug projection.
 13. A method as recited in claim 11, in which the step of providing the holding structure comprises the steps of: providing a barrel portion and a cap portion; and detachably attaching the cap portion to the barrel portion such that the barrel portion defines a portion of the side wall and the cap portion defines a portion of the side wall and the bottom wall.
 14. A method as recited in claim 11, in which the step of providing the holding structure comprises the steps of: providing a container portion and a projection member; and detachably attaching the projection member to the container portion such that the projection member defines the plug projection.
 15. A method as recited in claim 11, further comprising the steps of: attaching a support assembly to the holding structure; and arranging the support assembly in a retracted configuration; and arranging the support assembly in an extended configuration in which the support assembly supports the holding structure in a desired orientation relative to a support surface.
 15. A method as recited in claim 11, further comprising the steps of: providing a support rack; and arranging the holding structure on the support rack such that the support rack supports the holding structure in a desired orientation relative to a support surface.
 16. A holding system for a dispensing system for hardenable materials, the dispensing system comprising a dispensing gun and a product cartridge having a dispensing tip defining a dispensing opening, the holding system comprising: a holding structure comprising a side wall and a bottom wall, where the holding structure defines a main opening, a holding chamber, and at least one wall opening; a plug projection extending from the bottom wall into the holding chamber; and at least one guide rib extending from the side wall into the holding chamber; whereby the holding chamber is sized and dimensioned to receive the product cartridge; and when the product cartridge is placed into the holding chamber, the guide rib and the wall opening are arranged to facilitate entry of the plug projection into the dispensing opening.
 17. A holding system as recited in claim 16, in which a plurality of guide ribs extend from the side wall into the holding chamber, where, when the product cartridge is placed into the holding chamber, at least one of the guide ribs engages a portion of the dispensing system to facilitate entry of the plug projection into the dispensing opening.
 18. A holding system as recited in claim 17, in which the guide ribs define a central portion of the holding chamber and at least one perimeter portion of the holding chamber, where the guide ribs and at least one perimeter portion are sized, dimensioned, and located to allow the dispensing system to be displaced into the holding chamber such that the plug projection may enter the dispensing opening.
 19. A holding system as recited in claim 16, in which the holding structure comprises a barrel portion and a cap portion, where: the barrel portion defines a portion of the side wall; the cap portion defines a portion of the side wall and the bottom wall; and the cap portion is detachably attached to the barrel portion to facilitate access to the plug projection.
 20. A holding system as recited in claim 16, in which the holding structure comprises a container portion and a projection member, where: the container portion defines the side wall and the bottom wall; and the projection member is detachably attached to the container portion such that the projection member defines the plug projection. 